ipv6: avoid indirect calls for SOL_IP socket options

ipv6_setsockopt() can directly call ip_setsockopt()
instead of going through udp_prot.setsockopt()

ipv6_getsockopt() can directly call ip_getsockopt()
instead of going through udp_prot.getsockopt()

These indirections predate git history, not sure why they
were there.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240823140019.3727643-1-edumazet@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/ipv6/ipv6_sockglue.c

@@ -985,7 +985,7 @@ int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
 	int err;
 
 	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
-		return udp_prot.setsockopt(sk, level, optname, optval, optlen);
+		return ip_setsockopt(sk, level, optname, optval, optlen);
 
 	if (level != SOL_IPV6)
 		return -ENOPROTOOPT;
@@ -1475,7 +1475,7 @@ int ipv6_getsockopt(struct sock *sk, int level, int optname,
 	int err;
 
 	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
-		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
+		return ip_getsockopt(sk, level, optname, optval, optlen);
 
 	if (level != SOL_IPV6)
 		return -ENOPROTOOPT;